<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initi
       al-scale=1.0">
    <title>特殊场景this绑定实验</title>
</head>

<body>
    <button>按钮</button>
    <script>
        setTimeout(function () {
            console.log("定时器函数:", this);
        }, 1000);
        var btnEl = document.querySelector("button");
        btnEl.onclick = function () {
            console.log("btn的点击(onclick):", this);
        };
        btnEl.addEventListener("click", function () {
            console.log("btn的点击(addEventListener):", this);
        });
        var names = ["abc", "cba", "nba"];
        names.forEach(function (item) {
            console.log("forEach:", this);
        }, "aaaa");
    </script>
</body>

</html>